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                [Ahoi2013]好方的蛇                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">有一天，可爱的蛇心花怒放，把自己变成了一个正方形！但是她改变的时候<br />
被induce了导致改变出了些问题....&nbsp; <br />
&nbsp;<br />
按照预设，她应该变成一个N*N的全黑正方形，但是这个正方形出现了一些白的格子...现在她的身体不幸出了些小反应，定义一个subsnake是一个至少有两格的全黑矩形。 <br />
<img height="293" alt="" width="519" src="../file/3235_0.jpg" /></span></p>
<p><span style="font-size: medium"><span style="font-size: 12pt; color: black; font-family: 宋体; mso-hansi-font-family: 'Arial Unicode MS'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Arial Unicode MS'">现在蛇想让你帮忙求一下一共有多少对不相交的</span><span lang="EN-US" style="font-size: 12pt; color: black; font-family: &quot;Arial Unicode MS&quot;; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><font face="宋体, MS Song">subsnake</font></span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-hansi-font-family: 'Arial Unicode MS'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Arial Unicode MS'">，答案模</span><span lang="EN-US" style="font-size: 12pt; color: black; font-family: &quot;Arial Unicode MS&quot;; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><font face="宋体, MS Song">10007</font></span><span style="font-size: 12pt; color: black; font-family: 宋体; mso-hansi-font-family: 'Arial Unicode MS'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Arial Unicode MS'">。</span></span></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">第一行一个整数 N,&nbsp;&nbsp; 接下来N行，每行一个长度为N的字符串，如果是B，那么是黑的，如果是 W那么是白的。 </span></p>
<p><span style="font-size: medium">&nbsp;</span></p>
<p></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: 12pt; color: black; font-family: 宋体; mso-hansi-font-family: 'Arial Unicode MS'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 'Arial Unicode MS'">一行一个整数，表示答案</span></p></p><hr/><h3>样例输入</h3><pre>3 
BBW
BBW 
BWW 
</pre><hr/><h3>样例输出</h3><pre>5</pre><hr/><h3>提示</h3><p><p><span lang="EN-US" style="font-size: 12pt; color: black; font-family: &quot;Arial Unicode MS&quot;; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><font face="宋体, MS Song">N&lt;=1000</font></span></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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